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Appendix II.


A,  thus  recording a time-temperature curve.    The temperature
scale is graduated by reference to well-known phenomena, whose

FJUV. 836.

temperatures have been accurately obtained by the methods on
p. 587, and the junction at A should directly touch the source of

P. $pj. Steam Drier  or   Separator.—This apparatus is
now considered essential to an engine steam-pipe, especially if the


length of the latter be great, and the principles embodied in
various forms may be illustrated by Fig. 837. Steam enters at A,
and in passing round the helix to escape at c, deposits all the
moisture on the casing wall by centrifugal action, only dry steam
passing away.